I am owner of Toshiba Satellite C660-107 (PSC0LE). At this moment it is running on Intel T4500 CPU. According to Intel chipset Identification Utility chipset there is an Intel PM45 chipset - formerly Cantiga (supports 1066 MHz FSB CPU) installed on the motherboard. I tried to install P8400 CPU (1066 MHz FSB CPU) but unsuccesfull (laptop just starts and freeze without BIOS bootscreen). I suspect there is something wrong inside BIOS. I would appreciate it if you mod BIOS for me !